Plumbing fastener



FIG. 1 is a perspective view of a plumbing fastener in accordance with our new design;

FIG. 2 is a side elevation view thereof;

FIG. 3 is a bottom view of thereof; and,

FIG. 4 is a top view thereof.

The broken line is included for the purpose of illustrating portions of the plumbing fastener and forms no part of the claimed design. 

CLAIM We claim the ornamental design for a plumbing fastener, as shown and described herein. 